<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div {
            width: 100px;
            height: 100px;
            margin-top: 30px;
            margin-left: 20px;
            background-color: yellow;
            transform:rotate(50deg);
            }
    </style>
</head>
<body>
<div>看这里！</div>
</body>
</html>